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Ror1-Ror2 complexes modulate synapse formation in hippocampal neurons
S Paganoni1, J Bernstein, A Ferreira
1Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
Neuroscience
|December 5, 2009
Summary
Ror1 and Ror2 proteins are crucial for synapse formation in mammalian brain development. These receptors interact with Wnt-5a to regulate synaptogenesis in the central nervous system.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Ror1 and Ror2 tyrosine kinase receptors are involved in brain development in model organisms.
- Previous studies showed their role in neurite elongation in rat hippocampal neurons.
- Their function in mammalian central neuron development and associated signaling pathways remains unclear.
Purpose of the Study:
- To investigate the role of Ror1 and Ror2 in synapse formation in mammalian central neurons.
- To identify the ligands and signal transduction pathways involving Ror proteins.
- To elucidate the function of Ror proteins in mammalian central nervous system development.
Main Methods:
- Down-regulation of Ror1 or Ror2 in cultured hippocampal neurons.
- Analysis of synapse formation following Ror protein manipulation.
- Investigation of Ror1 and Ror2 interactions in mouse brain tissue.
- Assessment of Ror complex interaction with Wnt-5a.
Main Results:
- Down-regulating Ror1 or Ror2 significantly decreased synapse formation.
- Simultaneous targeting of Ror1 and Ror2 did not produce an additive effect.
- Ror1 and Ror2 were found to physically interact in the mouse brain, suggesting heterodimer formation.
- Ror complexes interacted with Wnt-5a, mediating its effects on synaptogenesis.
Conclusions:
- Ror1 and Ror2 play a critical role in synapse formation in the mammalian central nervous system.
- Ror proteins function as heterodimers and are integral to Wnt-5a signaling pathways.
- These findings highlight the importance of Ror proteins in Wnt-5a-mediated synaptogenesis in the CNS.
